Charge, conductors, insulators and semiconductors
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
A balloon rubbed on wool gains a charge of −8 nC. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Ari?
A plastic comb pulled through a wool cloth gains −1.6 nC. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Bo?
A Van de Graaff dome holds −32 nC of charge. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Esme?
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How well materials conduct electricity (general physics facts)
Material Conducts electricity copper very well aluminum very well silicon in between glass very poorly rubber very poorly Using the table, which material is best for the outer coat of a wire, Kira?
- Aluminum
- Copper
- Rubber
Using the table, which material is a semiconductor, Luz?
- Silicon
- Copper
- Glass, a clear solid
When a balloon is rubbed on wool, what actually moves, Milo?
- Electrons, wool to balloon
- Protons, from the balloon to the wool
- Air, from the wool to the balloon
A negative Van de Graaff dome is brought near a metal can without touching it. What happens in the can, Pia?
- Electrons jump onto it from the dome
- Its electrons shift away
- Nothing, since they don't touch
Which material is used to make most computer chips, Ren?
- Rubber, an insulator
- Copper, a conductor
- Silicon, a semiconductor
How can engineers change how well silicon conducts, Tala?
- By rubbing it on wool
- By adding tiny amounts of other elements
- By painting it a new color
A diode is made from semiconductors. What does it do in a circuit, Zee?
- Lets current flow one way only
- It stores its charge for good, like a battery
- Makes the battery bigger